Lettermint incident

[Ratelimit] Broadcast IP is rate-limited with Outlook (OLC)

Minor Resolved View vendor source →

Lettermint experienced a minor incident on February 18, 2026, lasting —. The incident has been resolved; the full update timeline is below.

Started
Feb 18, 2026, 01:08 AM UTC
Resolved
Feb 18, 2026, 01:08 AM UTC
Duration
—
Detected by Pingoru
Feb 18, 2026, 01:08 AM UTC

Update timeline

  1. identified Feb 17, 2026, 03:24 PM UTC

    Status: Identified We've identified that two of our outbound broadcast IP addresses have been ratelimited, affecting email delivery for some customers. The team is currently investigating the cause and working on delisting the IPs. In the meantime, the IP addresses has been suspended and will not be used until the issue is resolved. This does not affect other IPs in the pool nor transactional routes. These rate limits cause soft-bounces. We will keep retrying to send the emails. Affected components Outgoing (Broadcast) (Degraded performance)

  2. monitoring Feb 17, 2026, 04:26 PM UTC

    Status: Monitoring We're no longer seeing any bounces, but we'll keep monitoring it. Affected components Outgoing (Broadcast) (Operational)

  3. resolved Feb 18, 2026, 01:08 AM UTC

    Status: Resolved We are no longer seeing any deferrals related to these IP addresses and emails are sent out accordingly. Affected components Outgoing (Broadcast) (Operational)